As a friend of mine once eloquently put, "group efforts are best left to wolf packs."
In college, the professors like to push for group work. They know that employers don't like the way many of these generation Y kids don't "play well with others." When students complain, professors point out that we WOULD have to be able to work in a group in the work world. There are some problems with this, though.
In the work world, the work is done at work.
In the work world, many people have families (like spouse and kids, not mommy) so co-workers have grown out of the childish "I'll start it at 11pm the night before it's due," crap that college kids pull. (Then they wonnnnder why they have a 2 point something GPA.)
In the work world, someone is in charge. Whereas, at school, even if a team agrees to put you in charge, you have no authority.
The the work world, that is your only focus when you are there. Excessive socializing is usually not tolerated, either. Slackers are found out and the boss remembers. At school, the semester ends and the coattail riders move on to another A student next semester. The professors are also changing.
Finally, if you DO get stuck with all the work, it shouldn't matter since you're there TO WORK. Whereas with school, you manage your time. Doing all the work is actually MORE work, since you have to keep Emailing the other students who still don't approve or deny what you did. Hey, it's 5 days not even 5 hours before the thing is due, why do you have a bug up your @$$?